Abstract: In a laminated construction of a soundboard for use in musical instruments such as the piano, the use of a core having larger shearing elastic modulus and/or smaller shearing loss tangent than that of the fore and rear plates assures small shearing loss in the treble range, and greatly improves the total tonal balance over the entire tonal range.

Abstract: A sound board incorporated in a musical instrument such as, for example, a piano or a string instrument comprises a wooden plate member containing wood fibers substantially oriented to a first direction, and a plurality of thread members fixed to at least one major surface of the wooden plate member at spacings and extending in directions substantially parallel to the first direction, in which the wooden plate member has a first modulus of longitudinal elasticity to a force exerted thereto in a direction substantially parallel to the first direction and in which each of the thread members has a second modulus of longitudinal elasticity larger than the first modulus of longitudinal elasticity so that the sound board is reinforced against a force in the direction substantially parallel to the first direction only, thereby allowing the sound board to produce a soft deep sound.

Abstract: A structure for connecting a ski binding clamp to a ski, wherein one or more engagement members secured to the bottom part of a ski binding clamp are inserted into holding cavities of a corresponding number in a bracket secured to the top surface of a ski, after which the ski binding clamp is caused to move within the same horizontal plane as that of the ski, thus engaging the engagement members attached underneath thereof with engaging means provided in the bracket.